CMMVC8677E Retaining access to the auxiliary VDisk failed because either the master or the auxiliary VDisk is in mirrored mode.
Explanation
The master volume in an active-active relationship
can only be removed, keeping host access to the auxiliary volume,
when both the master and auxiliary volumes are in non-mirrored volume.
User response
Remove additional mirrors of the master and auxiliary volumes of the active-active relationship so each has only one mirror, then retry the command.